Gasket cutting machine



Patented Feb. 14, 1933 UNITED STATES CLARENCE C. LENARTH, OF GARDENA, CALIFORNIA GASKET CUTTING -MACHINE Application filed March 2, 1932. Serial No. 596,218.

The object of my invention is to provide a simple, cheap, and efficient machine for cutting gaskets of any shape from sheet packing material.

The object and advantages of my invention will be evident on inspection of the attached drawing, in which Fig. 1 is a side elevation of the assembled machine in a simplified form.

Fig. 2 is an end elevation of the reciprocating device as on the line 22 of Fig. 1 and Fig. 3 is a plan view of the device.

Referring to the drawing, 10-10 are angle plates suited to be bolted to a table as shown in broken section at 11. 1212 are upright standards bolted to these angles, these standards being, for instance, of A in. X 2 in. fiat steel. 13 is a supporting arm to which is bolted a pair of angles 14, only one of which shows in Fig. 1, and to these angles is bolted a working table 15.

Above the supporting arm 13 is fixed a second horizontal supporting arm 16 which carries the guide for the cutting tool. This guide may consist of a forked block 17 having a groove 18 cut in its face for the reciprocaion of the chisel 30. The chisel may be retained in this groove by means of a strap 19 held in place by small bolts 20. The arm 16 also supports two standards 21, between which is placed an eccentric 22 carried on a pin 23 and rotatable through a half-revolution by the handle 24:. Between the upper ends of the standards 12 is placed a symmetrical cam 25 revolved by a shaft 26 actuated, fgr ezample, by tight and loose pulleys 2 -2 The eccentric 22 acts as a journal for an arm 28, the outer or left end of which rides on the cam 25 while the inner or right end, materially reduced in area, engages a slot 29 in the chisel bar 30. This bar reciprocates in the groove 18. In order to prevent clattering between the cam and the rocker arm 28 the chisel bar may be pulled upwardly by a coil spring 31 suspended from an arm .32 which may be a continuation of the cover plate 19.

The lower edge of the chisel bar is drawn to a sharp edge and is also given a side rake as indicated at 33 in Figs. 1 and 2. The

stroke of the chisel bar should be such that the lower point of the chisel will rise say above the top of the table 15 at the upper end f the stroke. closely to the face of a hard steel shear plate 341, which should be reinovably fastened to a sii able supporting block 35 which, in turn,

4 The chisel edge 33 is fitted up i t s fastened to the lower face of the working olate 15.

In the position of the rocker arm shown at 28 in Fig. 1 the left end engages the cam and on rotation of the cam the right end causes a corresponding reciprocation of the chisel bar. On turning the handle 24 through a half revolution the eccentric 22 is thrown upwardly and the pivot of the rocker arm is correspondingly raised, throwing the left end out of contact with the cam as indicated by the dotted lines 28a. The reciprocating and cutting action of the chisel bar may thus be suspended without stopping the machine or throwing the belt from the tight to the loose pulley when a number of gaskets are to be out at one time.

By providing the table 15 with a number of small holes of equal diameter as indicated 3636 of Fig. 3 a pin of corresponding size may be passed through a sheet of gasket material which may then be revolved around the pin to cut a perfectly true circular gasket. It is desirable to space these holes by equal fractions of an inch from the chisel edge so that the size of the gaskets, which will of course be double the distance from the center of the pin to the cutting edge, maybe fixed in advance and without measurement.

By the use of the above described device gaskets may be readily cut from heavy and tough sheet material such as rubber, composition, wire insertion and sheet asbestos, in any desired form, with great rapidity, and without wastage.

W hile I have shown a simple form, it will be understood that the design shown in the drawing is subject to considerable modification without departure from the spirit of my invention, and that I claim all novelty consistent with the state of the art as set forth in the following claims.

I claim as my invention: 1. A gasket cutting machine, comprising: a cam and a means for rotating said cam; a chisel arranged for longitudinal reciproca- 'tion; a pivoted rocker arm, one'end of said arm arranged to contact with said cam, the other end of said arm actuating said chisel; means to raise the pivotal point of said arm to prevent contact between said arm and said cam; and a table having a shearing edge arranged to cooperate with the cutting edg of said chisel.

2. A gasket cutting machine, comprising: a cam and means for rotating said cam; a chisel arranged for longitudinal reciproca tion; a rocker arm and an eccentric pivot for said arm, one end of said arm arranged'to contact with said cam, the other end of said arm actuating said chisel; means for rotating #9 said eccentric pivot to carry said arm out of contact with said cam; and a table having a shearing edge arranged to cooperate with the cutting edge of said chisel.

In witness that I claim the foregoing I have hereunto subscribed my name this 24th day of February, 1932.

CLARENCE C. LENARTH. 

